Bearings for Roof Top Ventilators

Rooftop Ventilatorsroof top ventilatorPlastic radial or 4 point contact ball bearing assemblies are used in roof top ventilator applications. They are designed to be maintenance free and operate in challenging environments such as humidity, rain, snow, and hot or cold climates.


Roof Ventilation BearingCritical Design features: Acetal POM plastic races fitted with 316 stainless balls. Features a single or double row or 4 point contact True Race Technology™ ball groove construction for optimum load, stiffness, and moment loading capability.

Additional reasons for use:

  • Low friction: A KMS plastic race bearing will naturally have a lower coefficient of friction than a metal to metal ball bearing resulting in increased fan rotation at lower wind speeds.
  • Weight Savings: A KMS plastic ball bearing is 1/5 the weight of a steel bearing thereby reducing the amount of wind energy needed to rotate the ventilator.
  • Value added capability: A KMS plastic bearing can be designed to include mounting features for ease of assembly. A mounting feature can also be integrated to the application at no added cost to the bearing. This capability can reduce assembly time while improving the performance of your product.

Contact KMS today to learn more about how a plastic bearing can benefit your industrial application!

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Plastic Vs Steel

Cleanliness/Hygienic: Plastic bearings generally operate cleaner than metal bearings because they do not need lubrication, they are resistant to corrosion, and they can be washed down without the worry of re-lubing. This capability makes them a viable option for clean room environments, and wash down applications. A plastic bearing made from either PBT, PVDF or PEEK can be post sterilized by standard methods such as autoclave or Gamma.


Read all the benefits of Plastic vs Steel Bearings